Fan and cleaning equipment

The utility model discloses a fan and cleaning equipment, and relates to the technical field of fans. The draught fan comprises a shell, a first impeller, a second impeller, a driving device and a backflow device, the shell is provided with a first air inlet, a first air passing opening, a first air outlet, a first cavity and a second cavity, the scheme that the first impeller and the second impeller jointly suck air is adopted, primary compression is completed when airflow passes through the first impeller, and secondary compression is completed after the airflow passes through the second impeller; therefore, the fan can obtain higher vacuum degree and larger suction force after two-stage compression. Compared with the prior art, the first impeller and the second impeller do not need to adopt higher rotating speed, noise cannot be obviously increased, mechanical loss can be reduced at low rotating speed, pneumatic loss can be reduced under the guidance of the air inducing channel of the backflow device, and then the working efficiency of the fan is improved.